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Drilled pier foundation

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Drilled pier foundations have reinforcement (vertical
bars + ties or spirals) in the upper few feet of the
piers. Recently, I heard that it is common for the
construction folks to place the pier concrete and then
push a preassembled cage of reinforcement through the
concrete. Does this method guarantee that the rebar
can be placed reasonably close to the way it is
detailed on the drawing? Is'nt there a good chance
that the rebar may be bent and mangled?


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